@article{GDZPPN002402858, title = {Hyponormal Operators and Low Density Spectra.}, journal = {Mathematische Zeitschrift}, volume = {105}, year = {1968}, pages = {167-169}, zbl = {0157.45503}, url = {http://dml.mathdoc.fr/item/GDZPPN002402858} }
Putnam, C.R. Hyponormal Operators and Low Density Spectra.. Mathematische Zeitschrift, Tome 105 (1968) pp. 167-169. http://gdmltest.u-ga.fr/item/GDZPPN002402858/